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With our dams welded in place, we're ready for a high-quality body sealer designed to seal water out. The best sealer for the mission is 3M's Heavy Drip-Chek Sealer (PN 51135-08531). This is a super-tough, waterproof sealer that dries hard, yet flexible. It is excellent for drip rails, cowl-vent-dam seams, and just about anywhere water needs to be kept out.